Numerical Study on the Denitration Characteristics of Coke Oven Regenerative Coupled SNCR+SCR

被引：0

作者：

Zhao Y. ^{[1
]}

Feng J. ^{[1
]}

Li W. ^{[2
]}

Chen Y. ^{[3
]}

机构：

[1] School of Energy and Environmental Engineering, University of Science and Technology Beijing, Haidian District, Beijing

[2] Anshan Iron and Steel Research Institute, Anshan

[3] School of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2022年 / 42卷 / 04期

关键词：

Coke oven regenerator; Coupled denitrification; NO reduction; Numerical simulation; Selective catalytic reduction(SCR); Selective non-catalytic reduction (SNCR) +;

D O I：

10.13334/j.0258-8013.pcsee.211246

中图分类号：

学科分类号：

摘要：

Aiming at the current problems of coke oven flue gas application selective non-catalytic reduction(SNCR) or selective catalytic reduction(SCR) process denitration, a three-dimensional model of coupled SNCR+SCR in a new regenerator with ammonia injection space was established. Through the numerical simulation method, the heat storage index of different material physical parameters was optimized and evaluated, and the temperature and NO/NH3 concentration distribution characteristics of SNCR and SCR reaction zone were analyzed. The results showed that the coupled process occurred sequentially from SNCR to SCR, and it had obvious temperature gradient variation and cascade utilization characteristics of waste heat. The residence time in the SNCR reaction zone wais relatively large, ensuring the mixing degree of NH3 and NO, and achieving a NO reduction efficiency of 63.8%. In addition, the SNCR process also hads a competitive reaction of NO reduction and NH3 oxidation, and the main reaction zone wais located above the injection surface. Due to the low concentration and uneven distribution of NH3, the SCR reaction zone had a low reduction efficiency, which wais related to the structure of the regenerator and the catalyst coating area. However, the NO reduction efficiency of about 36% wais obtained in a single SCR process. It indicateds that the coupled process that NO reduction in the SNCR process and further reducing the NH3 in the SCR process couldan achieve the outlet NO/NH3 concentration to meet the emission standard, providing a theoretical basis for replacing the epitaxial SCR denitrification system. © 2022 Chin. Soc. for Elec. Eng.

引用

页码：1504 / 1513

页数：9

共 29 条

[1] PORAJ J, GAMRAT S, BODYS J, Et al., Numerical study of air staging in a coke oven heating system, Clean Technologies and Environmental Policy, 18, 6, pp. 1815-1825, (2016)
[2] GAMRAT S, PORAJ J, BODYS J, Et al., Influence of external flue gas recirculation on gas combustion in a coke oven heating system, Fuel Processing Technology, 152, pp. 430-437, (2016)
[3] ZOU Kun, WANG Danqiu, Technical transformation of NOx measuring point for outlet flue of SCR system, Power Generation Technology, 40, 2, pp. 155-160, (2019)
[4] LI Zishang, ZHU Renhan, DU Zhen, Et al., Analysis on the optimization technology of precise ammonia injection in SCR denitration system, Power Generation Technology, 42, 5, pp. 630-636, (2021)
[5] ZHOU Zhijian, WANG Xin, CHANG Jian, Et al., CFD simulation and optimization of SCR DeNOx system in a 660 MW coal-fired power plant, Proceedings of the CSEE, pp. 1-16, (2021)
[6] LIU Zhiming, ZHANG Shaoxuan, LI Junhua, Et al., Novel V2O5-CeO2/TiO2 catalyst with low vanadium loading for the selective catalytic reduction of NOx by NH3, Applied Catalysis B: Environmental, 158-159, pp. 11-19, (2014)
[7] YANG Likun, LIU Xunliang, TONG Yunyu, Et al., Optimization study on static mixer of SCR denitrification technology, Proceedings of the CSEE, 40, 22, pp. 7352-7364, (2020)
[8] YIN Tao, ZHANG Jiaping, YE Mingqiang, Et al., SCR de-nitrification pilot-plant test of flue gas from coking furnace, Chinese Journal of Environmental Engineering, 10, 12, pp. 7179-7182, (2016)
[9] YU Jian, LI Changming, GUO Feng, Et al., The pilot demonstration of a honeycomb catalyst for the DeNOx of low-temperature flue gas from an industrial coking plant, Fuel, 219, pp. 37-49, (2018)
[10] NGUYEN T D B, KANG T H, LIM Y I, Et al., Application of urea-based SNCR to a municipal incinerator: on-site test and CFD simulation, Chemical Engineering Journal, 152, 1, pp. 36-43, (2009)

← 1 2 3 →